输出Exception StackTrace到log文件

/*
 *输出e.printStackTrace()的内容到log文件

*/
package c1;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.io.*;
public class Test{
 public static void main(String[] args){
  SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd-HHmmss");
  TestOut.sLogFileName=sdf.format(new Date())+".log"; 
  try{
   throw new Exception();
  }
  catch(Exception e){
   //e.printStackTrace();
   TestOut.logStackTrace(e);
  }

  TestOut.log("hello");
  TestOut.log("hello1");

 }
}

class TestOut{
 public static String sLogFileName="";

 public static void log(Object x){
  System.out.println(x);
  
  try{
   BufferedWriter bw = new BufferedWriter( new FileWriter(sLogFileName,true));
   
    bw.write(new Date()+" -- "+x);
    bw.newLine();
    bw.close();
   //throw new IOException();
  }
  catch(IOException e){   
   e.printStackTrace();//System.out.println (e);
   System.out.println("failed to write "+x+" into file:"+sLogFileName);// print out the runtime variables
   System.exit(0); //terminate the program or Runtime.getRuntime().exit(0);
  }

 } 
 public static void logStackTrace(Exception e){
  TestOut.log(e.toString());

  StackTraceElement[] ste= e.getStackTrace();
  int stelength=ste.length;
  for(int i=0;i   Object x=ste[i];
   
   x="                             "+x;
   System.out.println(x);
   
   try{
    BufferedWriter bw = new BufferedWriter( new FileWriter(sLogFileName,true));
    
     bw.write(x.toString());
     bw.newLine();
     bw.close();
    //throw new IOException();
   }
   catch(IOException ioe){   
    ioe.printStackTrace();//System.out.println (e);
    System.out.println("failed to write "+x+" into file:"+sLogFileName);// print out the runtime variables
    System.exit(0); //terminate the program or Runtime.getRuntime().exit(0);
   }
  }

 } 
}
/*
输出结果：
java.lang.Exception
                             c1.Test.main(Test.java:13)
hello
hello1

log文件2010-01-18-102901.log内容：
Mon Jan 18 14:22:51 CST 2010 -- java.lang.Exception
                             c1.Test.main(Test.java:13)
Mon Jan 18 14:22:51 CST 2010 -- hello
Mon Jan 18 14:22:51 CST 2010 -- hello1
*/